Rotary cement-kiln and fuel-feeder therefor.



PATENTED MAR. 12, 1907.

C. A. MATGHAM.

ROTARY CEMENT KILN AND FUEL FEEDER THEREFOR.

APPLICATION FILED DEC.31. 1906.

4 SHEETS-SHEET 1.

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PATENTED. MAR. 12, 1907.

C. A. MATGHAM. ROTARY CEMENT KILN AND FUEL FEEDER THEREFOR.

APPLICATION FILED DEG.31. 1906.

4 SHEETS-SHEET 2,

PATENTED MAR. 12, 1907' c. A. MATGHAM. ROTARY CEMENT KILN AND FUELFEEDER THEREFOR.

APPLICATION FILED DBGHSI. 1906.

4 s EETs-sEEET 3.

No 847,257. PATENTED MAR. 12, 1907.

C. A. MATCH ROTARY CEMENT KILN AND FEEDER THEREFOR.

APPLIOATION FILE a .1906.

4 SHEETSSHEET 4.

CHAR-LES .AI'. MATOHAM, or" ALLENTOWN, PENNSYLVANIA.

ROTARY OEMENT-KILN AND FUEL-FEEDER THEREFOR.

Specification of Letters Patent. Application filed Decamber'iil, 1906,Serial No. 350,215.

Patented March 12,1907.

To all whom it m/Ly-mnteern:

Be it known that 1, CHARLES A. MA'roHAM, a citizen'oi the United States,residing in Allentown, Pennsylvania, have invented certain ImprovementsinRotary Cement-Kilns lowing is a specification.

My invention relates to certain improvements in rotary kilns for burningcement and to means for feeding pulverized fuel to be drawn into thekiln by natural draft.

I The object of my invention is to improve thecombustion of the fuelwithin the furnace and to provide means for pro erly feeding a 15 givenquantity of pulverize fuel, and to allow a sufficient volume of air,which may be at normal tem erature, to be drawn into the 4 furnace withth heated air to be drawn into the furnace at a .20 point below thefuel-opening.

the front hood. Fig. 3 is a similar view of the rear of the front hood.Fig. 4 is a vertical sectional view on the line 4 4, Fig. 2. o Fig/'5 isa sectional plan view of the front hood on the line 5 5,Fig. 2; andFigs. '6, 7, 8, and 9 are detached perspective views of parts of thefuel-feeder.

A is the rotary kiln. B is the rear hood, 5 communicating with the rearend of said kiln, on which is mounted a stack B. The stack is of such aheight and diameter as to cause the flame within, the rotary kiln toburn by naturaldraft. B is the front hood,

- 0 mounted in the usual manner and having wheels adapted to rails.

The rotary kiln A is carried b idlerwheels 0 c and driven by the usuageared mechanism C to cause it to slowly rotate.

45 F is the bin for the cement material." is

a conveyer leading from this bin to a chute f,

e fuel and a given volume of my invention.

preferably arranged at one side of the vertical center line andslightly-below-the horizontal center lineof the kiln, as clearlyillustrated in Fig. 2, the rotary kiln turning in the directionindicated by the arrow, Fig. 2. and Fuel-Feeders Therefor, of which thfol-- It will be understood that when the fur nace is rotating in thedirection of the arrow, Fig. 2, the material will accumulate on; theright-hand side of the furnace. I therefore make the fuel-feed openingnearer that side of the'furnace, so that the flame will come in contactwith the material and will be some clearly in Fig. 4, and place directlyunder this chute a plate e, having a li e turned down to very nearly theangle 0 the chute, so that the finely-powdered coal will drop onto thisplate and will slide into the furnace and be carried by the incoming airwhich passes through the air-s ace i, between the plate and the chute,an in order to extend this inclined lip I provide a plate a, which ismounted on a slideway m, plvotedat m, and

el into the kiln Without being previthis plate can be movedlongitudinally so as p to be projected into the kiln or withdrawn.therefrom. As this plate is subjected to considerable heat, I preferablymake it hollow, as shown, and connect it with pipes n and n oting theslideway m the plate n can be ti ted to any angle desired an moved-in orout, and if the plate is moved to the position shown in the drawings itwill form a contin'uation of the lip e, and some of the coal will passdown onto the inclined surface a of the plate before passing into thekiln. I prefer to form flanges n at each side of the inclined the fuelas it falls from the plate n.

, l I preferably provide an air-passage i between the plate e and thelate n, which is sufficient to carry some 0 the articles of coal awayfrom the edge of the hp e, and I provide an enlarged opening if underthe through which water is circulated. By ivportion a of the plate a toproperly direct I late a, so as to insure the carryin of all the l airto be drawn through the opening d, carrylinelypowdered coal into theiln. chute E communicates with a fuel-feed con- -veyer E, which in thepresent instance is a screw conveyor extending from a hopper E. Theopening is incased by a frame P, Fig. 6, secured to the angle-beams S Sby braces s s. The frame has &1I-P&SS&0BS p p, formed by verticalpartitions at eac side, as shown in Fig. 2, and the flow of air throughthese passages can be regulated by sliding dampers p.

A damper p is pivoted to the frame P, and.

of the kiln in a large volume, having a sliding contact with thematerial bein burned and with the exposed walls of the ki n.

In order that a large volume of heated air.

may pass into the kiln to be ro erly mixed wit the fuel and. air whic isadmitted through the feed-opening, l arch the front hood at (1*, in thepresent instance directly under the fuel-feed 0 ening, and form anenlarged flue d, whic communicates at its lowerend with the it-passage gand at its upper end with the ilnI Thus a large vol ume of heated air isdrawn into the kiln directly under the incoming powdered fuel and air,which may be 'at normal temperature, the heated air bodily supportingthe fuel, and the two bodies of air are thoroughly intermixed with thefuel and produce an intense flame, which will properly reduce thecementmaterial to clinker without the introduction of air under forcedblast. By this construction I moreconveniently burn the material to becalcined than heretofore, and I find that the fire-brick lining of thekiln is not burned or disintegrated to such an extent as when the fuelis introduced under a blast of air. The feed of the fuel 18 regular andpro- .duces an even flame, which will not underburn or overburn thematerial being calcined.

By my ex eriments I find that very good resu ts can e obtained with akiln eight feet long, live feet eight inches internal diameter, having astack ninety feet high and four feet internal diameter, using a burneras proportioned in the drawings, although the proportions of both kilnand burner may var with the material under treatment and wit 1 thequality of the coal used.

The operation of the apparatus is as follows: The material is fed intothe kiln in definite uantities through the chute f while the kiln isslowly rotated, "and the fuel is fed in given amounts through the chuteE, so as to fall in front of the air-inlet opening at the inner wall ofthe front hood. The natural draft at the'stack end of the kiln willcause The l ing With it the finely-divided fuel and at the same timecausing a relatively large volume of heated air to pass from the pitthrough the flue d to a point directly under the fuel-inlet opening (1.A flame will thus be immediately produced, being drawn through the kiln.so as to have a sliding contact with the material heivnlg treated andwith the walls of the kiln.

ile I prefer to use a high. stack to pro (luce a natural draft, othermeans may be used at the stack end of the kiln to produce an induceddraft.

-l have used in the claims the term substantially horizontal kiln,meaning a kiln that is arranged at a slight inclination, so that thematerial will travel from the inlet end to the discharge end of the kilnover the lower surface of the kiln, while the products of combustionwill have an uninterrupted flow from the fuel-feed opening to the stack.

The kiln can be operated in any suitable manner, so as to cause thematerial to flow through the kiln without departing fromthe essentialfeature of my invention.

I claim 1. In an apparatus for burning cement,

the combination of a substantially horizontal kiln, means for feedingcement material into one end of the kiln, there being an outlet for thedischarge of said material at the opposite end of the kiln, means forfeeding owdered fuel into the discharge end of-the iln, means at theinlet end of the kiln for creating a draft therethrough from the(lischarge end to the inlet end thereofsufficient to draw into the kilnthe powdered fuel and a volume of air, said kiln being free fromobstructions so that the flame is drawn in a substantially straight paththrough it in con tact with the cement material but with a minimumdisintegrating action upon the lining of the kiln, substantially asdescribed. I

2. In an apparatus for burning cement, the combination of asubstantially horizontal kiln, means for feeding cement material intoone end of the kiln,'a passage through which the material is dischargedat the opposite end relatively large opening for the passage of heatedair into the kiln, with means for creating at the inlet end of the kilna draft through the kiln from the discharge end to the inlet endvthereof so that powdered fuel and a limited volume of air, and arelatively larger volume of heated air will be drawn into the kiln, theflame being drawn through the kiln in contact with the cement material,but with a minimum of disintegrating effect upon the lining of the kiln,substantially as described.

3. In an apparatus for burning cement.

I duced so the combination of a substantially horizontal kiln, means forfeeding cement material into one end of the kiln, there being apassagefor the dischargp1 of said material at the 5 op osite end of the 'ln,meansa't thestack en of the kiln for creating a draft through the kilnfrom the discharge end to the stack end thereof, means for feedingpowdered fuel into the ldln, there being an opening to admit a limitedsupply of air with the fuel, and a passage for the admission of arelatively .larger volume of air, said assage being directly under theopening t rough which the incoming powdered fuel and air is introt at acombustible mixture will be immediately formed as the fuel enters thekiln, substantially as described. y

4. The combination in a substantially horizontal kiln communicating atone end 2o with a stack, of means for feeding material into the stackend of the kiln and discharging it at the opposite end of the kiln,means for feedin powdered fuel in a relativel dense mass directly intothe discharge end of the 2 5 kiln, there being a passa eat the dischargeend of'the kiln through W ich a large volume of heated air isfdrawn indirectly'under the powderedfuel, so as to spread and support said fuePand carryit into the combustion 0 zone of the furnace, substantially asdescribed.

i 5. In ail-apparatus for burning cement,

- the combination of a substantially horizonv I tal kiln, means forfeeding cement material into one end of the kiln, said kiln having atits opposite end a passage through whichthe -material is discharged,means'for delivering pulverized fuel to a fuel-feed opening in the hoodat the discharge .end of the kiln, the

i 0 hood having an opening for the passage of a limited quantity ofsair,there being a passage between the hood and the discharge end of the kilnfor the admission of a relatively larger quantity of air and means forcreatin 5v at the inlet end of the kiln a'draft throu the'kiln from thedischarge end to the in ct end thereof, whereby the pulverized fuel andthe air will be drawn into, and the flame drawn through the kiln incontact with the 5 cement material but with a minimum disintegratingeffect upon the lining of the kiln, substantially as described.

6. The combination in a kiln of the substantiallyhorizontal type, of afront hood having a fuel-feed opening, means for feeding fuel into" thekiln through said opening without previous admixture with air underpressure, and means for producing a draft to draw the fuel into thekiln, there being an 5; enlarged flue formed in the hood under thefuel-feed opening and communicating with the clinker-pit, whereby arelatively large volume of heated-air is drawn into the kilnsimultaneously with the fuel, substantially as described.

7. The combinationof the front hood of a l cementkiln having an opening,a fuel-feed chute extending into the opening, a plate under thefuel-feed chute having an extended lip turned down at such an angle thatthe pulverized fuel after lodging on the lip will pass off tially asdescribed.

8. The combination of a furnace provided with a front hood having afuel-feed opening,

with a chute for feeding pulverized fuel into the opening by gravity andwithout the aid of air under pressure, a fixed plate extending into theopening beyond the mouth -of the chute, and a longitudinally-adjustableplate under the fixed plate capable of being projected beyond the edgeof the fixed plate, substantially as described.

9, The combination with a cement-kiln of I the substantially horizontaltype, of a front hood havinga fuel-feed opening therein, a frame builtin the walls of the said front hood and terminating slightly back of theline of the inner wall thereof and a chute for feeding pulverized fuelby, gravity through said opening, there being a relatively deep flueformed in the walls of the hood directly under the opening for thepulverized fuel, so as to ermit of the passage of a relatively large odyof heated air into the kiln directly under said fuelfeed opening,substantially as described.

10. The combination with a cement-kiln of the substantially horizontaltype, of a front hood closing the outlet of the kiln and having afuel-feed opening extending therethrough, a chute for feeding pulverizedfuel into the said opening, and a plate upon which the powdered fuel isallowed to flow, said plate extending to such a point that the powderedfuel is discharged-into the kilnbefore it is mixed with incoming air,there being a relatively deep flue formed in the front hoodcommunicating with the clinker-pit and extending to a point directlyunder the fuel:

feed opening, substantially as described.

11. The combination with a cement-kiln of the substantially horizontaltype, of a front hood closing the end of the kiln and having a fuel-feedopening, a chute for feeding powdered fuel by gravity through. said ,0ening, there being air-passages at each side 0 the chute and anotherair-passage directly the same into the furnace, substan-- under thepoint of fuel-discharge for admit-" ting air with the fuel into thekiln, with a deep flue formed in the Walls of the front hooddirectly-under the fuel-feed opening and communicating directly with theinterior of the kiln and with. the clinker-pit, substantially asdescribed.

12. The comb nation with a cement-kiln, of a front hood having afuel-feed openin g, a chute, and a casing surrounding said fuelfeedopening and having two vertical partitions forming air-spaces at eachside of the partitions forming a central fuel-feed opening and sidean'passages, a chute secured to the casing and having an integral platewith an inclined lip, a longitudinzilly-adjustable water-cooled platedirectly under saidlipped plate, the parts being so proportionedthat airwill be admitted under the plate as well as at each side thereof,substantially as de-' scribed.

14. The combination of the front hood of a cement-kiln having afuel-feed opening, a casing surrounding said opening and having twovertical partitions forming a central fuelfeed opening and sideair-passe es, a chute secured to the casing, a plate. nnr er the chutehaving an inclined lip, a longitudinally-adjustableplate under thefirst-mentioned plate, and arocking frame on which the ad ustabl.e plateis mounted, substantially as described. a I

15. The combination of the end of a cement-kiln or'other filrnaee havinga fuel- 00d opening, with a fuel-feed chute, a plateunder the chute, andan adjustableplate under-the ilirst-mentioncd plate having a beveledportion and side lla-ngesat eaehside of the bev-' eled portion,substantially as described.

16; The combination with a cement-kiln or other furnace having afuel-feed opening in its front wall, of a casing in said opening, andextendin to a mint near theinner face of the wall, said wa ll beingflared from this point, a chute, two plates under the-chute, of whichone is adjustable, there being an airpassage at each side of the chute,and a central' air-passage under the plates, with means for regulatingthe i low of air through said passages, substantially as described,

17. The combination in a cement-kiln of the substantially horizontaltype, of a front hood having a feed-opening, a casing surrounding thefeer-l-open'ing and extending to a point near the inner face of the saidhood,

said inner face of the hood below the fuell'ced opening being cut awayto form a relatively deep flue directly under the fuel-feed opening forthe admission of the heated air from the clinker-pit, said openingcommunicating directly with the interior of the kiln, with a feed-chutefor the fuel discharged through said feed-opening into the kiln,substantially as described.

18. The combination in a cement-kiln, of a a front hood closing one endof the kiln and.

having a fuel-feed opening, a casing surrounding saidfuel-leed openingand having for feeding a continuous stream of owdered fuel to said chuteso that it Wlll two vertical partitions forming side air-passages and acentral fuel-feed passage, a chute secured to the said casing andarranged to dischar e fuel into the fuel-feed opening, an adjusta leplate under the said chute, there being an air-passage under the saidlate, and a relatively deep line under the fue -feed opening, said fluebeing formed in the hood and communicating with the clinker-pit andbeing connected to the fuel-feed openmg at a 7 oint back of the line ofthe inner-face of the mod, substantially as described. I

19. The combination of the front hood of a cement-kiln having afuel-feed openin therein, with a frame mounted in the saii' opening, twotransverse beams in the hood, one mounted above and the other below thefuel-feed opening, braces connecting the upper portion of the frame tothe u per beam and other braces connecting the ower portion of the framewith the lower beam, substantially as described.

20. The combination of the front hood of a cement-kiln having afuel-feed opening, with a frame mounted in said opening, twotransversebeams secured to the hood one above and the other below thefuel-feed opening, a brace connecting the upper end of the frame withthe upper beam, and another brace connectin the lower end of the framewith the lower cam, a fuel-feed ho per secured to the frame, and a plateun er the hopper, provided with an air-passage at each side of thehopper, there being an'air-passage below the hop er, substantially asdescribed. 1

2]. l he combination in a rotary cementkiln, of a fronthood having afuel-feed opening and a rear hood, a stack communicating with the rearhood, means for feeding material into the kiln, there being a dischargeoening for the material at the front hood, a

c inker-pit with which the discharge-opening communicates, a chute forpowdered fuel extending into the fuel-feed openlng, means ow down thechute by gravity, there being passages for the admission of a limitedvolume of air, and the passage for the dischar e of the material fromthe kiln bein of relatively large cross-sectional area and ormed in thehood directly under the fuel-feed opening, whereby a relatively largeproportion of heated an is drawn into the kiln. through said flue fromthe pit simultaneously with the fuel and the 120 limited volume of airdrawn in through the fuel-feed opcnin by the natural draft of the kiln,substantial y as described.

22. In an apparatus for burnlng cement the combination of'asubstantiallyhorizontal 1 kiln, means for feeding cement material intoone end of. the kiln, there being an outlet for .the discharge of saidmaterial and afuel-fecd opening at the opposite end of the kiln, a

stack communicating with theinletend-of the 1 0 fuel and shflicient airto support com kiln, said stack bein create a draft throu charge end tothe i stituting the sole means for drawini of such a height as to thekiln from the diset end thereof, and conin the. ustion, said kiln beingfree from obstructionsso that "the flame is-drawn in a substantiallystraight path through it in contact with the cement material, but with aminirnurn of disintegrating action upon the lining of the kiln, sub-, 1stantially as described.

In testimony whereof I have signed my name to this specification in thepresence of l two subscribin witnesses. p HARLES A. MATCHAM.

Witnesses:

HENRY HowsoN, Jos. H. KLEIN.

